Monkey Turn is a sports anime based around professional speed boat racing. The anime's protagonist, Tadano Kenji, is too short to follow his dream of becoming a professional baseball player, but his baseball coach recommends him to boat racing. One day Tadano-san unexpectedly meets his old girlfriend and they exchange promises: in return for her being faithful to him, he is charged with becoming Japan's best racer within three years. The eponymous Monkey Turn is a boat maneuver Kenji-san thought up while visiting his girlfriend. The Monkey Turn gives Kenji quite the advantage over other boaters, but is it enough for him become the best?—AniDB

Kenji Hatano originally wanted to be a baseball superstar, but didn't like how one player's mistake can hurt the whole team. Upon being shown a kyotei (mini-hydroplane) race by his coach and sees a special move called a monkey turn, he decides to try it out. After capsizing due to a monkey turn gone wrong, Kenji decides to become a professional kyotei racer. Two years later, he graduates from the Yamato Academy, and promises his friend Sumi Ubukata that he'll become Japan's #1 kyotei racer within three years.—Anime News Network